Configuring Optional Bridge Group Attributes

After you create a bridge group, you can configure the following optional attributes for the bridge group to manage the MAC address entries in the bridge group’s forwarding table:

• Enable or disable the bridge group’s ability to acquire dynamically learned MAC addresses; acquiring dynamic MAC addresses is enabled by default.

  host1(config)#bridge westford01 acquire

• Enable or disable the bridge group’s ability to filter (forward or discard) frames with a particular MAC source or destination address.

  host1(config)#bridge westford01 address 0090.1a40.4c7c forward atm 3/0.1

  host1(config)#bridge westford02 address 1011.22c2.333d discard

• Set the aging time of a dynamic (learned) entry in the forwarding table.

  host1(config)#bridge westford01 aging-time 200

• Set the maximum number of dynamic MAC addresses that a bridge group can learn.

  host1(config)#bridge westford02 learn 10000

You can also optionally enable SNMP link status processing for the bridge group. For example:

bridge acquire

• Use to enable or disable a specified bridge group’s ability to acquire dynamically learned MAC addresses; acquiring dynamic MAC addresses is enabled by default.
• Enables the bridge group to forward any frames it receives for nodes (stations) whose address it has learned dynamically.
• Example

  host1(config)#bridge westford01 acquire

• Use the no version to prevent the bridge group from acquiring dynamically learned MAC addresses and to limit forwarding only to those nodes that have a statically configured address entry in the forwarding table.
• See bridge acquire.

bridge address

• Use to enable or disable a specified bridge group’s ability to filter (forward or discard) frames based on their MAC address.
• Enables the bridge group to filter frames by their MAC address and add static (nonlearned) address entries to the forwarding table.
• Specify the following:
  • bridgeGroupName—Alphanumeric name of the bridge group specified in the bridge command
  • macAddress—Unique 48-bit (6-byte) physical address or hardware address of the LAN network interface card as a dotted triple of four-digit hexadecimal numbers
• Specify one of the following filter types:
  • forward—Forwards frames destined for the specified MAC address out the specified interface
  • discard—Discards (drops) frames sent from or destined for the specified MAC address without further processing
• If you use the forward keyword, you must additionally specify the following:
  • interfaceType—One of the following bridge interface types listed in Interface Types and Specifiers in JUNOSe Command Reference Guide:
    • atm
    • fastEthernet
    • gigabitEthernet
    • tenGigabitEthernet
  • interfaceSpecifier—Particular interface; format varies according to interface type; see Interface Types and Specifiers in JUNOSe Command Reference Guidefor information
• Example 1—Forwards frames destined for the node with MAC address 0090.1a40.4c7c out the specified Fast Ethernet interface

  host1(config)#bridge westford02 address 0090.1a40.4c7c forward
  fastEthernet 3/0.1

• Example 2—Drops frames sent from or destined for the node with MAC address 1011.22b2.333c

  host1(config)#bridge westford03 address 1011.22b2.333c discard

• Use the no version to remove the static MAC address entry from the forwarding table.
• See bridge address.

bridge aging-time

• Use to set the length of time, in seconds, that a dynamic (learned) MAC address entry can remain in a specified bridge group’s forwarding table.
• When a dynamic entry reaches its configured aging time, it “ages out” of the forwarding table.
• The default aging time is 300 seconds.
• The aging-time range is 1–1000000 seconds.
• Example

  host1(config)#bridge westford04 aging-time 1000

• Use the no version to restore the default value, 300 seconds.
• See bridge aging-time.

bridge learn

• Use to set the maximum number of dynamic (learned) MAC address entries that a specified bridge group can learn.
• For information about the maximum number of learned MAC address entries combined for all bridge groups on an E-series router, see JUNOSe Release Notes, Appendix A, System Maximums.
• The default value is 0 (zero) learned addresses. This default implies that there is no maximum number of learned entries for an individual bridge group; that is, an individual bridge group can learn an unlimited number of MAC addresses, up to the maximum number that the router supports.
• Example

  host1(config)#bridge westford05 learn 2000

• Use the no version to restore the default value, 0 (zero) learned addresses.
• See bridge learn.

bridge snmp-trap link-status

• Use to enable SNMP link status processing for a specified bridge group and to enable SNMP traps for all bridge interfaces configured in the bridge group.
• Example

  host1(config)#bridge westford06 snmp-trap link-status

• Use the no version to disable SNMP link status processing for the bridge group.
• See bridge snmp-trap link-status.

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